High volley it back low with some direction. A volley return gives you more time than any groundstroke. Stand in far enough you take it at some height you can handle.
If you can't do it, you can't. But, OlivierRochus can return JohnIsner's serve.

Quote:

Originally Posted by always_crosscourt

You're not allowed to volley a serve.

I think what Lee means is that you need to block it back with a volley motion. You are correct that you have allow a serve to hit the ground before you hit it.

Basically though you have two choices. Stand in and punch it back, or stand way back and take a cut at it. Even a shorter player that can get some good topspin on their first serve can make +100 mph serves kick up to your head as well.